Open AccessThree‐dimensional profiling of collimated radio‐frequency orbital angular momentum beams
Author(s) -
Hamilton Joshua K.,
Berry Simon J.,
Spencer Joseph H.,
Lawrence Christopher R.,
Smith Francis C.,
Drysdale Timothy D.
Publication year - 2020
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2019.0808
Subject(s) - collimated light , angular momentum , physics , profiling (computer programming) , orbital angular momentum multiplexing , optics , computational physics , orbital angular momentum of light , total angular momentum quantum number , computer science , classical mechanics , laser , operating system
The use of orbital angular momentum (OAM) modes in radio communication is thought to enhance capacity. This work focuses on using the l = +1 mode transmitted from a 180 mm diameter, 8‐element circular antenna array. The transmitted OAM beam was collimated by using a spherical mirror and the intensity and phase were investigated. A xyz scanning stage was used to profile the propagating OAM beam in three dimensions, resulting in a detailed investigation into the effects of collimation on the OAM beam. The proposed system was shown to reduce the beam divergence from 36.6° to 1.2°, without affecting the OAM mode purity of the beam for a frequency range of 4–6 GHz. This investigation showed a step towards realising practical control over the divergence of OAM‐carrying beams.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom